Can you guys please help.me treat fin rot. My little guys sick and it has to be fin rot. Water parameters are good 0ppm ammonia, 0ppm nitrite and 5 ish ppm nitrate. I think it was caused by another fish which I got from the pet store, he died in 4 days after I got him. He is a platy. On hand I have furan-2 but I could get salt tommorow. Also do I need to quarantine, it seems to got on afew tetras too.